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Melexis

TH72002 Datasheet Preview

TH72002 Datasheet

ASK Transmitter

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TH72002
315MHz
ASK Transmitter
Features
! Fully integrated PLL-stabilized VCO
! Frequency range from 290 MHz to 350 MHz
! Single-ended RF output
! ASK achieved by on/off keying of internal
power amplifier up to 40 kbit/s
! Wide power supply range from 1.95 V to 5.5 V
! Very low standby current
! On-chip low voltage detector
! High over-all frequency accuracy
! Adjustable output power range from
-12 dBm to +11 dBm
! Adjustable current consumption from
3.2 mA to 10.3 mA
! Conforms to FCC part 15 and similar standards
! 8-pin Small Outline Integrated Circuit (SOIC)
Ordering Information
Part Number
Temperature Code
TH72002
K (-40°C to 125°C)
Package Code
DC (SOIC8)
Delivery Form
98 pc/tube
2500 pc/T&R
Application Examples
! General digital data transmission
! Tire Pressure Monitoring Systems (TPMS)
! Remote Keyless Entry (RKE)
! Wireless access control
! Alarm and security systems
! Garage door openers
! Remote Controls
! Home and building automation
! Low-power telemetry systems
Pin Description
ASKDTA 1
n. c. 2
ROI 3
ENTX 4
TH72002
8 VEE
7 OUT
6 VCC
5 PSEL
General Description
The TH72002 ASK transmitter IC is designed for applications in the 315 MHz industrial-scientific-medical
(ISM) band. It can also be used for any other system with carrier frequencies ranging from
290 MHz to 350 MHz.
The transmitter's carrier frequency fc is determined by the frequency of the reference crystal fref. The inte-
grated PLL synthesizer ensures that carrier frequencies, ranging from 290 MHz to 350 MHz, can be
achieved. This is done by using a crystal with a reference frequency according to: fref = fc/N, where N = 32 is
the PLL feedback divider ratio.
3901072002
Rev. 007
Page 1 of 20
Data Sheet
June/07




Melexis

TH72002 Datasheet Preview

TH72002 Datasheet

ASK Transmitter

No Preview Available !

TH72002
315MHz
ASK Transmitter
Document Content
1 Theory of Operation ...................................................................................................3
1.1 General............................................................................................................................. 3
1.2 Block Diagram .................................................................................................................. 3
2 Functional Description ..............................................................................................4
2.1 Crystal Oscillator .............................................................................................................. 4
2.2 ASK Modulation................................................................................................................ 4
2.3 Crystal Pulling................................................................................................................... 4
2.4 Output Power Selection.................................................................................................... 5
2.5 Lock Detection.................................................................................................................. 5
2.6 Low Voltage Detection...................................................................................................... 5
2.7 Mode Control Logic .......................................................................................................... 6
2.8 Timing Diagrams .............................................................................................................. 6
3 Pin Definition and Description ..................................................................................7
4 Electrical Characteristics ..........................................................................................8
4.1 Absolute Maximum Ratings .............................................................................................. 8
4.2 Normal Operating Conditions ........................................................................................... 8
4.3 Crystal Parameters ........................................................................................................... 8
4.4 DC Characteristics............................................................................................................ 9
4.5 AC Characteristics .......................................................................................................... 10
4.6 Output Power Steps ....................................................................................................... 10
5 Typical Operating Characteristics ..........................................................................11
5.1 DC Characteristics.......................................................................................................... 11
5.2 AC Characteristics .......................................................................................................... 14
6 Test Circuit ...............................................................................................................17
6.1 Test circuit component list to Fig. 18 .............................................................................. 17
7 Package Description ................................................................................................18
7.1 Soldering Information ..................................................................................................... 18
8 Reliability Information..............................................................................................19
9 ESD Precautions ......................................................................................................19
10 Disclaimer .................................................................................................................20
3901072002
Rev. 007
Page 2 of 20
Data Sheet
June/07


Part Number TH72002
Description ASK Transmitter
Maker Melexis
Total Page 20 Pages
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